\begin{tikzpicture}
	\tkzDefPoints{0/0/O, 1.5/0/A, -1.5/0/B}
	\tkzDrawLine[add=0.1 and 0.1](B,A)
	\tkzMarkAngle[-stealth,size=0.5](A,O,B)
	\tkzDrawPoint[fill=black](O)
	\tkzLabelPoints[below](O, A, B)
\end{tikzpicture}

